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coreos-base/misc-files: Make Kubernetes work by default through symlink

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In the past user had to customize Kubernetes or use a bind mount to make
writing the default /usr/libexec/kubernetes/ path work. With
systemd-sysext on by default the bind mount doesn't work anymore because
it can get lost. A newer workaround is to use a systemd-sysext image
that creates a symlink in /usr/libexec/... to redirect to somewhere
under /var/.
Instead of relying on workarounds, make Kubernetes work by default on
Flatcar by having the symlink be part of the generic image. The target
folder will be created through a tmpfiles rule.
This commit is contained in:
Kai Lueke 2023-10-09 18:42:06 +02:00
parent dd3bbac09c
commit 06ae3b26e3
2 changed files with 6 additions and 0 deletions
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1
changelog/changes/2023-10-09-kubernetes-usr-libexec.md Normal file
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@ -0,0 +1 @@
- To make Kubernetes work by default, `/usr/libexec/kubernetes/kubelet-plugins/volume/exec` is now a symlink to the writable folder `/var/kubernetes/kubelet-plugins/volume/exec` ([Flatcar#1193](https://github.com/flatcar/Flatcar/issues/1193))

5
sdk_container/src/third_party/coreos-overlay/coreos-base/coreos-init/coreos-init-9999.ebuild vendored
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@ -58,4 +58,9 @@ src_install() {
for compat in modules flatcar coreos ; do
dosym "../lib/${compat}" "/usr/lib64/${compat}"
done
# Create a symlink for Kubernetes to redirect writes from /usr/libexec/... to /var/kubernetes/...
# (The below keepdir will result in a tmpfiles entry in base_image_var.conf)
keepdir /var/kubernetes/kubelet-plugins/volume/exec
dosym /var/kubernetes/kubelet-plugins/volume/exec /usr/libexec/kubernetes/kubelet-plugins/volume/exec
}